结晶紫-聚乙烯醇体系分光光度法测定水中溶解氧  

Determination of DO in Water by IO_3^--I^-—Crystal Violet-Polyvinyl Alcohol Spectrophotometry

作　　者：沙鸥[1,2] 许兴友[1,2] 马卫兴[1,2] 郭妍 龚强[1] 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005 [2]江苏省海洋生物技术重点建设实验室,江苏连云港222005 [3]连云港金兆水务有限公司,江苏连云港222005

出　　处：《环境监测管理与技术》2009年第5期42-45,共4页The Administration and Technique of Environmental Monitoring

基　　金：江苏省高校自然科学研究计划基金资助项目(05KJB150003);江苏省海洋生物技术重点建设实验室基金资助项目(2005HS010);淮海工学院自然科学研究基金资助项目(Z2007045)

摘　　要：在碘量法测定水中溶解氧的基础上,利用I3-与结晶紫在聚乙烯醇存在下结合成电中性的离子缔合物,以碘酸钾为标准溶液,与过量碘化钾反应生成碘,加入结晶紫后在550 nm处有最大吸收的原理测定水中溶解氧,优化了试验条件,考察了共存离子的干扰。方法在0.002 7 mg/L^0.55 mg/L范围内符合比尔定律,检出限为0.001 1 mg/L,蒸馏水平行测定的RSD≤0.2%,加标回收率为100%~101%,实际水样测定与碘量法和溶解氧测定仪结果一致。The method was established for determining dissolved oxygen in water by IO^-3-I^--crystal violet- PVA spectrophotometry. A ion-association complex （ maximum absorbance at 550 nm） was formed after the reaction of I^-3 and crystal violet to determine DO in water. Test conditions were optimized and interfere of co-exist-ence ions were observed to produce following results： Beer＇s law was obeyed at the DO concentration from 0.0027mg/L to 0.55 mg/L; the detective limits 0.0011mg/L; RSD of distilled water parallel samples 0.2% ; the recoveries of spiked samples from 100% to 101% ; water samples detective results in agreement with those results of Winkler method and dissolved oxygen meter method.

关 键 词：溶解氧 结晶紫 聚乙烯醇 分光光度法 水质 

分 类 号：O657.32[理学—分析化学]